• 제목/요약/키워드: Feedback Compensation

검색결과 312건 처리시간 0.023초

포커스 그룹 인터뷰를 통한 학교기반 청소년 금연 프로그램 효과성 제고 방안 (Ways to Improve Effectiveness of School-Based Smoking Cessation Intervention for Adolescents: Implications from Focus Group Interviews)

  • 남성희;전종설
    • 보건교육건강증진학회지
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    • 제29권3호
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    • pp.35-51
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    • 2012
  • Objective: The objective of this study is to explore factors that contribute toward improving the effectiveness of school-based smoking cessation programs for Korean adolescents. Methods: Thematic analysis was done on the feedback gathered from a focus group interview of 5 instructors with ample service experience at smoking cessation programs provided in school settings. Results: This study has identified 9 categories of initiatives that may contribute to improving the quality of existing programs. These nine categories were grouped into the following 4 themes. 1) Improvement in the structure of intervention: the programs should be restructured to allow more instruction time and better instruction environment; 2) Improvement in the content of intervention: the programs should develop differentiated contents considering the characteristics of adolescence; 3) Importance of rapport, adolescents' interests and compensation: the program should be more interesting to adolescents and provide rewards based on the rapport between instructors and adolescents; 4) Cooperation among smoking cessation instructor, school, and community: instructors, teachers at schools, and communities should cooperate actively with one another. Conclusions: The school-based smoking cessation programs will benefit from implementing the findings of this study in improving its effectiveness in smoking cession in adolescents.

마찰 보상을 갖는 컨테이너 크레인의 흔들림 억제 추종 제어 (Anti-Sway Tracking Control of Container Cranes with Friction Compensation)

  • 백운보;신진호
    • 한국생산제조학회지
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    • 제21권6호
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    • pp.878-884
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    • 2012
  • In this paper, we consider the sway suppression control problem for container cranes with the frictions between the trolley and the rail. If the friction effects in the system can be modelled, there is an improved potential to design controllers that can cancel the effects. The proposed control improves the trolley positioning and sway suppressing against various frictions. The proposed synthesis combines a variable structure control and the adaptive control to cope with various frictions including the unknown constants. First, the variable structure control with the simple switching action is designed, which is based on a class of feedback lineariztion methods for the fast stabilization of the under-actuated sway dynamics of container. Second, the adaptive control with a parameter estimation is designed, which is based on Lyapunov stability methods for suppressing the oscillation of the trolley travelling, especially due to Coulomb friction in the vicinity of the target position. The asymptotic stability of the overall closed-loop system is assured irrespective of variations of rope length. Simulation are shown under initial sway, external wind disturbances, and various frictions.

Real-Time Vehicle Detector with Dynamic Segmentation and Rule-based Tracking Reasoning for Complex Traffic Conditions

  • Wu, Bing-Fei;Juang, Jhy-Hong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제5권12호
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    • pp.2355-2373
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    • 2011
  • Vision-based vehicle detector systems are becoming increasingly important in ITS applications. Real-time operation, robustness, precision, accurate estimation of traffic parameters, and ease of setup are important features to be considered in developing such systems. Further, accurate vehicle detection is difficult in varied complex traffic environments. These environments include changes in weather as well as challenging traffic conditions, such as shadow effects and jams. To meet real-time requirements, the proposed system first applies a color background to extract moving objects, which are then tracked by considering their relative distances and directions. To achieve robustness and precision, the color background is regularly updated by the proposed algorithm to overcome luminance variations. This paper also proposes a scheme of feedback compensation to resolve background convergence errors, which occur when vehicles temporarily park on the roadside while the background image is being converged. Next, vehicle occlusion is resolved using the proposed prior split approach and through reasoning for rule-based tracking. This approach can automatically detect straight lanes. Following this step, trajectories are applied to derive traffic parameters; finally, to facilitate easy setup, we propose a means to automate the setting of the system parameters. Experimental results show that the system can operate well under various complex traffic conditions in real time.

전류제어형 PWM 컨버터에 의한 순시 무효전력 보상장치 (Instantaneous Reactive Power Compensator using Current Controlled PWM Converter)

  • 최재호;김상훈;박민호
    • 대한전기학회논문지
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    • 제38권7호
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    • pp.539-548
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    • 1989
  • 본 논문에서는 싸이리스터 부하에서 발생하는 무효전력과 고조파를 보상하기 위한 순시무효전력 보상장치에 관하여 기술하였다. 저자는 기본파 위상 지연과 고조파 전류외형에 기인하는 순시무효전력을 새로이 정의하고 순시전력흐름의 관점에서 그 물리적 의미를 고찰하였다. 순시전압 및 순시전류의 궤환에 의해 순시무효전력을 계산하고, 이를 부하와 병렬로 연결된 전류제어형 PWM컨버터에 의해 보상하였다. PWM컨버터는 전류오차 백터제어방식에 의한 전류제어 PWM 기법을 사용함으로써 우수한 전류제어특성을 실현할 수 있었다. 시뮬레이션과 실험을 통하여 정상상태 및 과도상태에서의 탁월한 보상특성이 입증되었다.

A 12.5-Gb/s Optical Transmitter Using an Auto-power and -modulation Control

  • Oh, Won-Seok;Park, Kang-Yeob;Im, Young-Min;Kim, Hwe-Kyung
    • Journal of the Optical Society of Korea
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    • 제13권4호
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    • pp.434-438
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    • 2009
  • In this paper, a 12.5-Gb/s optical transmitter is implemented using 0.13-${\mu}m$ CMOS technology. The optical transmitter that we constructed compensates temperature effects of VCSEL (Vertical cavity surface emitting laser) using auto-power control (APC) and auto-modulation control (AMC). An external monitoring photodiode (MPD) detects optical power and modulation. The proposed APC and AMC demonstrate 5$\sim$20-mA of bias-current control and 5$\sim$20-mA of modulation-current control, respectively. To enhance the bandwidth of the optical transmitter, an active feedback amplifier with negative capacitance compensation is exploited. The whole chip consumes only 140.4-mW of DC power at a single 1.8-V supply under the maximum modulation and bias currents, and occupies the area of 1280-${\mu}m$ by 330-${\mu}m$ excluding bonding pads.

인본주의 게임에서의 데시효과(Westerners effect)를 활용하는 심리적 측면에서 분석 및 연구 (PSYCHOLOGICAL ANALYSIS AND RESEARCH ON WESTERNERS EFFECT IN HUMANISTIC GAME)

  • 이현흠
    • 디지털융복합연구
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    • 제18권1호
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    • pp.295-300
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    • 2020
  • 심리학자 데시 (Dessie)께서는 과도한 보상은 사물에 대한 개인의 관심과 본질적 동기를 감소시킬 수 있다고 말하며 이를 서양인 효과라고 합니다. 본 논문에서는 인본주의와 서양인 효과의 관점에서 게임을 검토 할 것이며 3가지의 합리적인 보상 방법을 제시 할 것입니다. 향후 연구 방향은 본 논문의 이론을 사용하여 게임에서 과제를 완료 한 후 보상 방법을 설정하고 완성 된 게임의 감정적 피드백에 대한 시험 보고서를 플레이어에게 제공 할 것입니다.

A Novel Method to Suppress Mid-Frequency Vibrations with a High Speed-Loop Gain for PMSM Control

  • Li, Qiong;Xu, Qiang;Huang, Shenghua
    • Journal of Power Electronics
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    • 제16권3호
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    • pp.1076-1086
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    • 2016
  • PI controllers are one of the most widely used controllers in industrial control systems due to their simple algorithms and stability. The parameters Kp and Ki determine the performance of the system response. The response is expected to improve by increasing the gain of the PI controller. However, too large a gain will accelerate the speed response and cause vibrations, which is not what is expected. This paper proposes a way to suppress vibrations by detecting the vibration frequency and extracting the vibration signal as a compensation to the speed feedback. Additionally, in order to improve its disturbance rejection ability, a low-order disturbance observer is proposed. This paper also explains the operation principle of the proposed method by analyzing the transfer function and it describes the design of the controller parameters in detail. Simulation and experimental results are provided to verify the merits of the proposed method. These results also show the good performance of the proposed method. It has a rapid response and suppresses vibrations.

외란 소거법을 이용한 강인한 전력 계통 안정화 장치 설계 (Design of Robust Power System Stabilizers Using Disturbance Rejection Method)

  • 김도우;윤기갑;김홍필;양해원
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 C
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    • pp.1195-1199
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    • 1998
  • In this paper a design method of robust power system stabilizers is proposed by means of robust linear quadratic regulator design technique under power system's operating condition change, which is caused by inner structure uncertainties and disturbances into a power system. It is assumed that the uncertainties present in the system are modeled as one equivalent signal. In this connections an optimal LQR control input for disturbance rejection, the output feedback gain for eliminating the disturbance are calculated. In this case. PSS input signal is obtained on the basis of weighted ${\Delta}P_e$ and $\Delta\omega$. In order to stabilize the overall control of system. Pole placement algorithm is applied in addition. making the poles of the closed loop system to move into a stable region in the complex plane. Some simulations have been conducted to verify the feasibility of the proposed control method on a machine to infinite bus power system. From the simulation results validation of the proposed method could be achieved by comparisons with the conventional PSS with phase lag-lead compensation.

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PID제어기를 이용한 스캐너의 속도 및 위치 제어 (A study on speed and Position of scanner Using PID controller)

  • 여봉현;정영창;홍철호;김재욱;김문수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 D
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    • pp.3178-3180
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    • 2000
  • In this thesis, a controller which is appropriate for uses of scanner with small error and high speed response is proposed. Recently the application field of scanner is on increase. In case of applying to laser marking, the error of scanner has bad effect to quality. Also it can make difficulties in applying laser show that makes images, unless the high speed response is not realized. For these reasons, a controller that can adjust error and response is need. Because scanner must respond to step input that is put between a few millisecond and hundreds of microsecond with small revolution angle ranges, it is advantageous to have small inertia and large torque. First, the property of scanner is treated, and then using Op-amp and passive components and applying feedback compensation PID controller to design, the effects by controller coefficients are introduced.

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전류정보를 이용한 가변속냉동시스템의 열교환기 실시간 고장 진단 (On-line Fault Detection and Diagnosis for Heat Exchanger of Variable Speed Refrigeration System Based on Current Information)

  • 이동규;정석권
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2007년도 동계학술발표대회 논문집
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    • pp.88-94
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    • 2007
  • This study deals with on-line fault detection and diagnosis for heat exchanger of variable speed refrigeration system. Conventional studies about fault of heat exchanger in refrigeration system have used temperature and pressure information. The temperature and pressure are able to be used valuably for faults detection of constant speed refrigeration system. However in case of variable speed refrigeration system, the temperature and pressure are no longer useful information for fault detection due to compensation effect of feedback controller. While current information is possible to detect faults of variable speed refrigeration system. The current information was detected in an inverter, it was used after transforming rms value. The faults of variable speed refrigeration system are divided into electrical faults and mechanical faults. We performed fault detection and diagnosis about heat exchanger among mechanical faults such as condenser fouling and evaporator fan fouling through some experiments.

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